【摘要】 以SiCl4为脱氟剂,对包钢选矿厂尾矿进行碳热氯化反应。考察了反应时间、反应温度、脱氟剂对尾矿中稀土氯化产率的影响。结果表明,在脱氟剂存在下,700~800℃时氯化反应2h,氯化率高达95%以上。氯化产物的酸不溶物的X射线衍射结果表明,450~500℃时,酸不溶物为稀土氟化物和SiO2、Fe2O3及独居石;700℃时为SiO2和少量的独居石;900℃时为SiO2及少量的独居石和稀土氟化物。更多还原

【Abstract】 Carbothermic chlorination reaction is made on the tailings of BaoSteel Concentrator with SiCL4 as the de-fluorine agent.The effect of the reaction time, reaction temperature and de-fluorine agent on the yield of rare-earth chloride is investigated.The results indicate that at the presence of de-fluorine agent and at a temperature between 700~800℃, the chlorination reaction time is 2h and the chlorination rate is as high as above 95%.The X-ray diffraction of the acid-insoluble substance of the chloride product shows that the acid-insoluble content includes rare-earth fluoride, SiO2, Fe2O3 and monazite between 450~500℃; SiO2 and a small amount of monazite at 700℃; and SiO2 and a small amount of monazite and rare-earth fluoride at 900℃.更多还原